CONFIG_YAFFS2_MTD_ENABLED must also enable the MTD section of yaffs_internal_read_super().

The MTD part in yaffs_internal_read_super() was compiled in only if
CONFIG_YAFFS_MTD_ENABLED was set.
Now do it if CONFIG_YAFFS_MTD_ENABLED or CONFIG_YAFFS2_MTD_ENABLED are set.


-- Luc Van Oostenryck